/*
 * Copyright (c) 2011-2012 Alexander Dubu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * o  Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * o  Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * o  Neither the name Axil nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package axil.framework.xml;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import static axil.framework.Functions.abort;


/**
 * A factory that uses a parameter-less constructor for creating objects as part
 * of XML deserialization.
 */
class ConstructorFactory extends XMLFactory {
	private Constructor constructor;


	private ConstructorFactory(Constructor constructor) {
		this.constructor = constructor;
	}


	public static ConstructorFactory from(Class type) {
		try {
			Constructor c = type.getDeclaredConstructor(InputXML.class);
			c.setAccessible(true);
			return new ConstructorFactory(c);
		} catch (NoSuchMethodException e) {
			// IGNORED
		}
		return null;
	}


	/**
	 * Get the name of the tag used to represent the object constructed by this
	 * factory. If no such tag is known, then an exception is thrown; the value
	 * returned is never null.
	 */
	public String tag() {
		throw abort("Wrong type of factory.");
	}


	/**
	 * Tell if this factory recognizes the given tag and can construct an object
	 * from it. This is only used when dealing with abstract types.
	 */
	public boolean matches(String tag) {
		return false;
	}


	/**
	 * Construct a new instance of the type represented by this factory object.
	 * The value returned is never null.
	 */
	public <T> T construct(InputXML xml) {
		try {
			return (T)constructor.newInstance(xml);
		} catch (InstantiationException e)	{
			throw abort(e);
		} catch (IllegalAccessException e)	{
			throw abort(e);
		} catch (InvocationTargetException e)	{
			throw abort(e);
		}
	}
}
